NCCCO CORE STUDY GUIDE

NCCCO CORE STUDY GUIDE

ANSWERS TAGGED A+

✔✔On a mobile crane, the measurement for the load radius in this distance from the center of gravity of the suspended load to the: - ✔✔Center of rotation of the crane

✔✔On a mobile crane, should the load be applied when determining the proper boom angle? - ✔✔Yes

✔✔On a mobile cranes range digram, boom length and boom angle can be used to determine? - ✔✔Load radius

✔✔On a mobile crane, what is the weight of the slowed jib that is deducted in load chart calculations called? - ✔✔Effective weight

✔✔When determining boom tip elevation for a mobile crane, the user could: use the range diagram - ✔✔use the range diagram

✔✔When lifting off the main boom, how is the effective weight of the flyjib different in the erected position from that of the stowed position? - ✔✔Effective weight increasses

✔✔Why do most crane manufacturers reduce load capacity for duty-cycle operations? - ✔✔Side loading forces may occur

✔✔What is the difference between anti-two-block warning device and an anti-two-block prevention device? - ✔✔Warning device only warns, but prevention devices will stop the functions

✔✔How can the LMI's boom length or load radius reading be verified? - ✔✔Actual measurements

✔✔On mobile cranes, what does the boom angle indicator show the operator? - ✔✔Angle of boom to horizontal

✔✔What is the device called that automatically stops the boom when it nears the cranes maximum angle? - ✔✔Boom hoist limiting

✔✔When the number of layers of wire rope on a drum increases the: - ✔✔Allowable line pull decreases

✔✔On a mobile crane, side loading of the boom could be caused by which of the following? - ✔✔Starting or stopping the swing too rapidly

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✔✔Which person listed below, has the responsibility for determining the correct weight of a load? - ✔✔Lift Director

✔✔What must an operator do when an operator leaves the controls of the crane from an extended period of time? - ✔✔Apply all brakes and dogs, and lower the load to the ground

✔✔When should a tag line be used, during the hoisting of material? - ✔✔When the rotation of the load would be dangerous

✔✔What percentage of the rated capacity of a mobile crane must be used when lifting with two cranes attached to the same load? - ✔✔75%

✔✔When lifting a load with two mobile cranes, it is very important to: - ✔✔Keep the hoist lines of both cranes vertical

✔✔If lifting a load with two mobile cranes of different rated capacities, the crane with the larger rated capacity should: - ✔✔Be hooked at a distance closer to the loads center of gravity

✔✔When performing a multiple crane lift is is important for the operator's of each crane to understand that: - ✔✔The weight may increase if the other crane lands the load

✔✔When lifting loads that are submerged under water with a mobile crane, what is one of the conditions that the operator should be familiar with? - ✔✔Load will increase when lifting the load out of the water

✔✔When lifting over water with a personnel platform, what are the occupants of the platform required to wear? - ✔✔A floatation device

✔✔What is the minimum pitch diameter used for sheaves in a boom hoist reeving system using rotation resistant wire rope? - ✔✔Not less than 18 times rope diameter

✔✔When can capacity altering modifications be made to mobile cranes? - ✔✔When permission is given by the crane manufacturer

✔✔A crane is at the point of instability when the crane's leverage on the load equals: - ✔✔100% of the load's leverage on the crane

✔✔Who must determine maximum speed for a mobile crane to travel with a suspended load? - ✔✔The competent person

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